154991382 has 64 divisors (see below), whose sum is σ = 393867264. Its totient is φ = 39553920.

The previous prime is 154991381. The next prime is 154991387. The reversal of 154991382 is 283199451.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154991381) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12348 + ... + 21504.

It is an arithmetic number, because the mean of its divisors is an integer number (6154176).

Almost surely, 2^154991382 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 154991382, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196933632).

154991382 is an abundant number, since it is smaller than the sum of its proper divisors (238875882).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

154991382 is a wasteful number, since it uses less digits than its factorization.

154991382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9213.

The product of its digits is 77760, while the sum is 42.

The square root of 154991382 is about 12449.5534859689. The cubic root of 154991382 is about 537.1585797864.

The spelling of 154991382 in words is "one hundred fifty-four million, nine hundred ninety-one thousand, three hundred eighty-two".